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Stable and efficient PbS colloidal quantum dot solar cells incorporating low-temperature processed carbon paste counter electrodes
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2017 (English)In: Solar Energy, ISSN 0038-092X, E-ISSN 1471-1257, Vol. 158, p. 28-33Article in journal (Refereed) Published
Abstract [en]

Colloidal quantum dot (CQD) solar cells with a ZnO/PbS-TBAI/PbS-EDT/carbon structure were prepared using a solution processing technique. A commercially available carbon paste that was processed at low-temperatures was used as a counter electrode in place of expensive noble metals, such as Au or Ag, which are used in traditional PbS CQD solar cells. These CQD solar cells exhibited remarkable photovoltaic performance with a short circuit density (Jsc) of 25.6 mA/cm2, an open circuit voltage (Voc) of 0.45 V, a fill factor (FF) of 51.8% and a power conversion efficiency (PCE) as high as 5.9%. A reference device with an Au counter electrode had a PCE of 6.0%. The PCE of the carbon-containing CQD solar cell remained stable for 180 days when tested in ambient atmosphere, while the PCE of the Au-containing CQD solar cell lost 48.3% of its original value. Electrochemical impedance spectroscopy (EIS) demonstrated that holes within the PbS CQD were effectively transported to the carbon counter electrode.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 158, p. 28-33
Keywords [en]
Carbon paste, Counter electrode, PbS quantum dot, Solar cell, Electrochemical electrodes, Electrochemical impedance spectroscopy, Electrodes, Nanocrystals, Open circuit voltage, Quantum efficiency, Semiconductor quantum dots, Solar power generation, Temperature, Carbon counter electrodes, Carbon pastes, Colloidal quantum dots, Counter electrodes, Pbs colloidal quantum dots, Photovoltaic performance, Power conversion efficiencies, Solution-processing, Solar cells, carbon, colloid, electrochemistry, electrode, energy efficiency, low temperature, performance assessment, photovoltaic system, quantum mechanics, solar power
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Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-218652DOI: 10.1016/j.solener.2017.07.074ISI: 000418974500004Scopus ID: 2-s2.0-85029706795OAI: oai:DiVA.org:kth-218652DiVA, id: diva2:1161238
Note

QC 20171129

Available from: 2017-11-29 Created: 2017-11-29 Last updated: 2018-01-29Bibliographically approved

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Sun, Licheng

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Organic ChemistryZhejiang-KTH Joint Research Center of Photonics, JORCEP
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